C S Rushil & Co.Chartered Accountants

19 September 2026 · Written by CA Rushil C S

Statutory Audit vs Tax Audit vs Internal Audit: What Is the Difference

Chennai business owners often treat "audit" as one thing, but statutory, tax, and internal audit are three separate exercises with different triggers.

Business owners in Chennai often use the word audit as if it means one single thing, but statutory audit, tax audit, and internal audit are three separate exercises with different purposes, different triggers, and often different people conducting them.

Statutory audit

A statutory audit is required under company law for every registered company regardless of size or turnover, and it examines whether the financial statements present a true and fair view of the company's financial position. It is conducted by an independent chartered accountant appointed as the statutory auditor and results in an audit report that gets filed with the annual accounts. LLPs above a certain turnover or contribution threshold also require this.

Tax audit

A tax audit is required under the Income Tax Act once a business or professional's turnover or gross receipts cross a specified threshold, and its purpose is narrower: verifying that the accounts comply with income tax provisions and that reported figures used for computing tax are accurate. It results in a tax audit report filed along with the income tax return, and is a completely separate requirement from statutory audit, even though the same chartered accountant is often engaged for both.

Internal audit

Internal audit is not primarily about statutory compliance but about evaluating a company's internal controls, risk management, and operational efficiency. Certain classes of companies are legally required to have an internal audit function under company law, but many businesses without that legal obligation still choose to have one because it genuinely helps catch inefficiencies, fraud risk, and process gaps before they become bigger problems.

Why the distinction actually matters to you

A small business owner might assume that because their statutory auditor already reviewed the books, no other audit obligation applies. But tax audit applicability depends purely on turnover thresholds under a different law entirely, and missing this obligation because you thought the statutory audit covered it is a common and costly mistake.

A simple way to check what applies to you

  • Confirm your entity type: statutory audit is mandatory for companies and larger LLPs regardless of turnover
  • Check your turnover or gross receipts against the current tax audit threshold under income tax law
  • Assess whether your company falls into the category legally required to have internal audit
  • Even if not legally required, consider whether internal audit would genuinely add value given your size and complexity

If you are unsure which audits actually apply to your Chennai business this year, C S Rushil & Co. can review your specific numbers and confirm your obligations before a deadline catches you off guard. Book a free consultation.

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